State Historic Bridge Inventory and Evaluation (2024 Update)

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STATE HISTORIC BRIDGE INVENTORY AND EVALUATION 2024 UPDATE Tier 1:Activities with No Potential to Cause Effects Activities in this tier are those that would cause minimal changes to historic bridges and includes, but is not limited to, certain cleaning and painting activities, minor asphalt repairs, certain utility repairs, in- kind repair or replacement of existing non-structural bridge components, and some non-destructive material sampling, testing, or sensor placement. Tier 2:Activities with No Adverse Effects Pending Application of Guidance in the Best Practices Manual Activities in this tier must follow the Best Practices Manual's Tier 2 guidance and requires consistency with the SOI Standards for the Treatment of Historic Properties. Work covered by Tier 2 includes and is not limited to masonry and mortar repair and cleaning, concrete sealing and repairs, in-kind replacement of structural members, vegetation clearing, scour repair, utility repair or replacement, replacement of wearing surfaces, minor repairs to railings or parapets, sidewalk repairs and maintenance, cleaning with spray or brushes, and repainting of entire structures. Tier 3:Activities with No Adverse Effects Pending Application of Guidance in the Best Practices Manual and with Approval of an SOI-Qualified Professional Activities in this tier require involvement of an SOI-qualified professional to assess a project's effects on the historic bridge and determine whether the project qualifies for review under the Historic Bridges PA. Tier 3 activities must follow the Best Practices Manual's Tier 3 guidance and requires consistency with the SOI Standards for the Treatment of Historic Properties. Projects that occur within potential, eligible, or listed historic districts automatically fall under Tier 3. Work covered by Tier 3 includes and is not limited to more extensive masonry and mortar repair and cleaning using chemicals, concrete sealing using epoxy and in-kind repairs that replicate sculptural reliefs or designs, extensive in-kind replacement of structural members or addition of new structural members, vegetation clearing that also requires masonry removal, new scour repair, installation of new utilities, evaluation of remnant bridge structures or components, replacement of wearing surfaces with new materials that differ from existing, major repairs to railings or parapets that may involve changing the original appearance, sidewalk modifications for accessibility or installation of new pedestrian paths, cleaning with high-pressure spray or application of anti-graffiti coatings, and painting of previously unpainted structures. If any activities within Tier 3 may result in an adverse effect on a historic bridge, as determined following review by an SOI-qualified professional, then the Historic Bridges PA will not apply, and the project must go through the standard Section 106 process. o¢ 16